CN110445406A - A kind of bimodal smooth transition control method of PWM rectifier - Google Patents
A kind of bimodal smooth transition control method of PWM rectifier Download PDFInfo
- Publication number
- CN110445406A CN110445406A CN201910632631.8A CN201910632631A CN110445406A CN 110445406 A CN110445406 A CN 110445406A CN 201910632631 A CN201910632631 A CN 201910632631A CN 110445406 A CN110445406 A CN 110445406A
- Authority
- CN
- China
- Prior art keywords
- soft
- modulation ratio
- pwm rectifier
- ratio
- pwm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a kind of bimodals of PWM rectifier to seamlessly transit control method, the method is to be to have additional that modulation ratio is soft to open controller between the double-closed-loop control device of PWM rectifier and pwm pulse signal generation module, modulation ratio when opening controller by the way that modulation ratio is soft and start PWM rectifier is descending to be gradually lowered to steady-state value, and then inhibit PWM rectifier inrush current, the soft structure for opening controller of modulation ratio is divided into three parts, before the starting of PWM rectifier controlled rectification, the soft mathematical model for opening controller of modulation ratio isk=0；It carves on startupt 0To starting finish timet 1Between, the soft mathematical model for opening controller of modulation ratio isk=k 2‑k 1 t, modulation ratio is soft open after the soft mathematical model for opening controller of modulation ratio becomek=1；Controller segmentation starting is opened by the way that modulation ratio is soft, the dash current of PWM rectifier Startup time generation is completely eliminated, achievees the purpose that smooth transition.
Description
Technical field
The present invention relates to a kind of control method of three-phase voltage PWM rectifier, especially a kind of PWM rectifier no current punching
The method of controlling security hit.
Background technique
It is main that side filter inductance is exchanged by the shutdown control of opening of bridge arm IGBT because PWM rectifier is on startup
The charge and discharge time is DC side power supply, so Three-Phase PWM Rectifier can be divided into two kinds from the state of filter inductance, one is electricity
Sense charging, puts aside energy；Another kind is inductive discharge for DC side charging, when charging between and discharge time reach straight when balance
Stream side voltage just reaches stable；In PWM rectifier starting, will lead to if initial modulation is smaller than amplitude in the first circuit
State for time is too long, and inductance is similar to connect between exchange side two-phase power supply at this time, and increase in current rate is very fast, causes biggish
Dash current influences lifetime of system and safety.
Common inrush current suppressing method has: margining amplitude technique, such as Publication No.: CN104734481A；Target voltage
It is worth parabola rule and starts method, such as Publication No.: CN103904873A；Vector type soft start method, such as Publication No.:
CN107196496A and parabola superposition ramp function start method, such as Publication No.: CN105915039A, according to formula, the common ground of these methods is all by reducing electricity
Press output valve, that is, current inner loop d axis reference value of outer ring pi regulatori d *, it is greater than reference value when actual current increasesi d *When,m d
It will increase, to reduce the time of net side induction charging, reduce dash current, but the common ground of these methods is all to practical system
The electric current of system is greater than rated current, that is, can just generate inhibitory effect after generating dash current, can not inhibit to start in this way
Just start due to the too small bring dash current of modulation ratio.
Summary of the invention
In order to improve the deficiency of above-mentioned existing control method, the bimodal that the present invention provides a kind of PWM rectifier is smoothed
Control method is crossed, this method is that modulation is added between the double-closed-loop control device and pwm pulse signal generation module of PWM rectifier
Controller is opened than soft, the soft effect for opening controller of modulation ratio is when PWM rectifier inrush current does not generate also by changing
Become modulation ratio, and then change switching mode and achieve the purpose that inhibit dash current, specific technical solution is as follows:
A kind of bimodal smooth transition control method of PWM rectifier, it is characterised in that: the bimodal seamlessly transits controlling party
Method is to have additional that modulation ratio is soft to open controller between the double-closed-loop control device and pwm pulse signal generation module of PWM rectifier；
The double-closed-loop control device is for controlling PWM rectifier DC-side Voltage Stabilization；The modulation ratio is soft open controller be for
Amplify modulation ratio when PWM rectifier starting, inhibits inrush current；The pwm pulse generation module is for generating PWM
The control switch device of pulse signal is connected.
In the above-mentioned technical solutions: the PWM rectifier is that three-phase first is calculated by double-closed-loop control device on startup
Modulation ratiom a 、m b、 m c ；Then willm a 、m b、 m c It inputs the soft controller that opens of the modulation ratio and new three-phase modulations ratio is calculatedm a *、m b * 、 m c *, it then by the pwm pulse signal generation module output switching signal, controls the PWM rectifier and starts to work.
A further technical solution lies in: the PWM rectifier double-closed-loop control device and the soft controller that opens of modulation ratio start
When design process are as follows:
(1) controller mathematical model of the rectifier under dq coordinate system is established are as follows:
Wherein:K vP ,K vI ,K iP ,K iI It is the proportionality coefficient and integral coefficient of outer voltage, current inner loop respectively；v dc *It is direct current mother
The reference value of line voltage；i d *,i d *It is the given value of electric current loop d axis and q axis respectively,i d ,i q Respectively practical current on line side d axis with
The component of q axis,ωFor voltage on line side fundamental wave frequency,i cd ,i cq Respectively filter capacitor electric current d axis and q axis component,L T To hand over
Stream side inductance (L T =L 1+L 2)；
(2) three-phase modulations ratio, calculation formula is calculated in modulation ratio d axis, q axis component according to obtained in (1) are as follows:
Wherein:m a,m b,m cFor three-phase modulations ratio,C 2r/3s For the transformation matrix of three-phase static coordinate system to two-phase rotating coordinate system；
(3) by the three-phase modulations in (2), than input, modulation ratio is soft opens controller, obtains new modulation ratio expression formula are as follows:
Wherein:m a *、m b *、m c *For the soft modulation ratio for opening controller output of modulation ratio；
(4) according to the soft three-phase modulations ratio for opening controller output of modulation ratiom a *、m b * 、 m c * PWM rectifier ON operation is controlled.
Further technical solution also resides in: the modulation ratio soft mathematical model for opening controller when startingkIt is as follows:
FunctionkIn expression formula:
v trmFor triangular carrier amplitude, TsFor the triangular carrier cycle,ωFor voltage on line side fundamental wave frequency,t 1It is modulation ratio soft
Finish time,t 0For PWM rectifier Startup time,e d For the d principal axis transformation component of three-phase modulations ratio,v dc For DC voltage.
Wherein: the soft controller that opens of modulation ratio is the letter of falling slope that a linear rule is decremented to 1 when PWM rectifier starts
Number.
A kind of bimodal of PWM rectifier of the above-mentioned offer of the present invention seamlessly transits control method, and existing voltage is soft opens
Technology is compared, and increases that modulation ratio is soft to open controller, can be in PWM rectifier controllable initiating, gradually by amplification modulation ratio
Increase the charging time of inductance, it is suppressed that dash current generates.
Detailed description of the invention
Fig. 1 is PWM rectifier main circuit of the present invention and control figure.
Fig. 2 is the soft mathematical model curve graph for opening controller of modulation ratio of the present invention.
Fig. 3 is that the present invention directly initiates PWM rectifier experimental waveform.
Fig. 4, which is that PWM rectifier voltage reference value of the present invention slope is soft, opens experimental waveform.
Fig. 5 is that PWM rectifier of the present invention is based on that modulation ratio is soft opens experimental waveform.
Specific embodiment
A specific embodiment of the invention is further illustrated below.
Implement a kind of bimodal smooth transition control method of PWM rectifier, the bimodal smooth transition control
Method processed follows these steps to carry out:
Step 1: three-phase modulations ratio first is calculated by double-closed-loop control device when starting in PWM rectifierm a 、m b、 m c ；
Step 2: between on startupt 0-t 1It is interior,m a 、m b、 m c New three-phase modulations ratio is calculated in the input soft controller that opens of modulation ratiom a *、m b * 、 m c *；
Step 3: according to new three-phase modulations ratiom a *、m b * 、 m c *By pwm pulse signal generation module output pulse signal, control
The work of PWM rectifier.
First step particular content includes: to carry out uncontrollable rectifier by the diode on three-phase bridge arm first, completes DC side electricity
Hold pre-charge process, then detects alternating voltage amplitude, frequency and ac-side current and whether DC voltage is in normal
It is worth range, after completing detection, AC compounent is simultaneously converted to the direct current under dq coordinate system point by acquisition voltage on line side, current signal
Amount completes voltage and current double closed-loop, voltage feed-forward control calculates and current inner loop decoupling computation obtains modulation ratio d axis, q axis point
Amount, obtains three-phase modulations ratio by coordinate transformm a 、m b、 m c 。
Second step particular content includes: the three-phase modulations ratio for enabling the first step obtainm a 、m b、 m c It is input to that modulation ratio is soft to open control
In device processed, new three-phase modulations ratio is obtained, proportionality coefficientk
Expression formula:
FunctionkIn expression formula:
m 0Calculation formula are as follows:
v trmFor triangular carrier amplitude, TsFor the triangular carrier cycle,ωFor voltage on line side fundamental wave frequency,t 1It is modulation ratio soft
Finish time,t 0For PWM rectifier Startup time,e d For the d principal axis transformation component of net side three-phase voltage,v dc For DC voltage.
Third step particular content includes: the three-phase modulations ratio for obtaining second step using SPWM principle, generates three-phase bridge arm
Switching signal, control PWM rectifier work.
Specific embodiment 1
Specific embodiments of the present invention combination attached drawing 1 and attached drawing 2 illustrate, attached drawing 1 is PWM rectifier main circuit and control figure,v dc
For DC voltage,S ap、S an、S bp、S bn、S cp、S cnFor six IGBT switching tubes of three-phase rectifier,e a、e b、e c, for power grid electricity
Pressure,L 1、L 2、C 1For the net side inductance, inverter side inductance and filter capacitor of LCL filter, R1 R2Inductance parasitic resistance,i dc
For DC supply input electric current,i ga、i gb、i gcFor current on line side,i La、i Lb、i LcFor bridge arm side electric current, CFor DC bus capacitor, R
For direct current lateral load；What the specific embodiment of the invention illustrated is a kind of bimodal smooth transition control method of PWM rectifier,
PWM rectifier is stepped up filling for exchange side filter inductance on startup mainly by the amplitude of control three-phase modulations ratio
The electric time achievees the purpose that the non-impact current starting of Three-Phase PWM Rectifier, the specific steps are as follows:
Step 1: carrying out uncontrollable rectifier by the diode on three-phase bridge arm first, DC bus capacitor precharge is completed.
Step 2: whether detection alternating voltage amplitude, frequency and ac-side current and DC voltage are in normal value
Range, after completing detection, AC compounent is simultaneously converted to dq coordinate system by acquisition voltage on line side, filter capacitor electric current, current signal
Under DC component.
Step 3: function curve 1 shown in 1 is slowly increased the given value of DC voltage with reference to the accompanying drawingsv dc *, according to as follows
The d axis q axis component of formula calculating three-phase modulations ratiom d 、m q ；
。
Step 4: according toObtain three-phase modulations
Thanm a 、m b、 m c 。
Step 5: the three-phase modulations ratio for enabling the 4th step obtainm a 、m b、 m c The input soft controller that opens of modulation ratio obtains new three
Phase modulation ratiom a *、m b * 、 m c * PWM rectifier ON operation is controlled.
It is one by falling ramp function and constant function splices that above-mentioned Startup time modulation ratio is soft, which to open controller mathematical model,
Made of piecewise function, mathematical modelkFunction expression it is as follows:
FunctionkIn expression formula:
m 0Calculation formula are as follows:
In formula:v trmFor triangular carrier amplitude, TsFor the triangular carrier cycle, ω is voltage on line side fundamental wave frequency, t1For modulation ratio
Soft finish time, t0For PWM rectifier Startup time,e dFor the d principal axis transformation component of net side three-phase voltage,v dcFor DC side electricity
Pressure.
Step 6: the three-phase modulations that the 5th step obtains are believed than the switch of three-phase bridge arm is calculated using SPWM principle
Number, control PWM rectifier work.
Modulation ratio when above-mentioned specific embodiment is by amplification PWM rectifier starting, and then PWM rectifier is avoided by not
Controllable state is to the dash current generated when controllable state transition.
Claims (5)
1. a kind of bimodal of PWM rectifier seamlessly transits control method, it is characterised in that: the bimodal smooth transition control
Method is to have additional that modulation ratio is soft to open control between the double-closed-loop control device and pwm pulse signal generation module of PWM rectifier
Device；The double-closed-loop control device is for controlling PWM rectifier DC-side Voltage Stabilization；The soft controller that opens of the modulation ratio is to use
To amplify modulation ratio when PWM rectifier starting, inhibition inrush current；The pwm pulse generation module is for generating
The control switch device of pwm pulse signal is connected.
2. the bimodal of PWM rectifier as described in claim 1 seamlessly transits control method, it is characterised in that: the PWM is whole
Stream device is that three-phase modulations ratio first is calculated by double-closed-loop control device on startupm a 、m b、 m c ；Then willm a 、m b、 m c Described in input
New three-phase modulations ratio is calculated in the soft controller that opens of modulation ratiom a *、m b * 、 m c *, then it is defeated by the pwm pulse signal generation module
Switching signal out controls the PWM rectifier and starts to work.
3. the bimodal of PWM rectifier as claimed in claim 2 seamlessly transits control method, it is characterised in that: the PWM is whole
Stream device double-closed-loop control device and the soft design process opened when controller starts of modulation ratio are as follows:
(1) controller mathematical model of the rectifier under dq coordinate system is established are as follows:
Wherein:K vP ,K vI ,K iP ,K iI It is the proportionality coefficient and integral coefficient of outer voltage, current inner loop respectively；v dc *It is direct current mother
The reference value of line voltage；i d *,i d *It is the given value of electric current loop d axis and q axis respectively,i d ,i q Respectively practical current on line side d axis with
The component of q axis,ωFor voltage on line side fundamental wave frequency,i cd ,i cq Respectively filter capacitor electric current d axis and q axis component,L T To hand over
Stream side inductance (L T =L 1+L 2)；
(2) three-phase modulations ratio, calculation formula is calculated in modulation ratio d axis, q axis component according to obtained in (1) are as follows:
Wherein:m a,m b,m cFor three-phase modulations ratio,C 2r/3s For the transformation matrix of three-phase static coordinate system to two-phase rotating coordinate system；
(3) by the three-phase modulations in (2), than input, modulation ratio is soft opens controller, obtains new modulation ratio expression formula are as follows:
Wherein:m a *、m b *、m c *For the soft modulation ratio for opening controller output of modulation ratio；
(4) according to the soft three-phase modulations ratio for opening controller output of modulation ratiom a *、m b * 、 m c * PWM rectifier ON operation is controlled.
4. the bimodal of PWM rectifier as claimed in claim 3 seamlessly transits control method, it is characterised in that: tune when starting
System is than the soft mathematical model for opening controllerkIt is as follows:
FunctionkIn expression formula:
v trmFor triangular carrier amplitude, TsFor the triangular carrier cycle,ωFor voltage on line side fundamental wave frequency,t 1It is tied for modulation ratio soft
The beam moment,t 0For PWM rectifier Startup time,e d For the d principal axis transformation component of three-phase modulations ratio,v dc For DC voltage.
5. the bimodal of PWM rectifier as claimed in claim 4 seamlessly transits control method, it is characterised in that: PWM rectifier
The soft controller that opens of modulation ratio is the ramp function that falls that a linear rule is decremented to 1 when starting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910632631.8A CN110445406B (en) | 2019-07-14 | 2019-07-14 | Dual-mode smooth transition control method of PWM rectifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910632631.8A CN110445406B (en) | 2019-07-14 | 2019-07-14 | Dual-mode smooth transition control method of PWM rectifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110445406A true CN110445406A (en) | 2019-11-12 |
| CN110445406B CN110445406B (en) | 2021-10-26 |
Family
ID=68430431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910632631.8A Active CN110445406B (en) | 2019-07-14 | 2019-07-14 | Dual-mode smooth transition control method of PWM rectifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110445406B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910283A (en) * | 2021-03-09 | 2021-06-04 | 山东建筑大学 | Method and system for simultaneously restraining common-mode voltage and circulating current of modular parallel rectifier |
| CN116015037A (en) * | 2023-01-10 | 2023-04-25 | 合肥尚源电气科技有限公司 | Voltage type PWM rectifier control system for inhibiting starting overcurrent |
| CN116365855A (en) * | 2023-01-07 | 2023-06-30 | 安徽大学 | Starting control method for three-phase voltage type PWM rectifier |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783597A (en) * | 2010-03-31 | 2010-07-21 | 山东新风光电子科技发展有限公司 | Dynamic reactive compensation device based on direct current side active structure and amplitude adjustment control |
| CN103855717A (en) * | 2014-03-27 | 2014-06-11 | 安徽工业大学 | Pulse-free soft starting method of low-voltage SVG (static var generator) |
-
2019
- 2019-07-14 CN CN201910632631.8A patent/CN110445406B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783597A (en) * | 2010-03-31 | 2010-07-21 | 山东新风光电子科技发展有限公司 | Dynamic reactive compensation device based on direct current side active structure and amplitude adjustment control |
| CN103855717A (en) * | 2014-03-27 | 2014-06-11 | 安徽工业大学 | Pulse-free soft starting method of low-voltage SVG (static var generator) |
Non-Patent Citations (1)
| Title |
|---|
| 刘龙等: "单相PWM整流器启动控制策略分析", 《变频器世界》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112910283A (en) * | 2021-03-09 | 2021-06-04 | 山东建筑大学 | Method and system for simultaneously restraining common-mode voltage and circulating current of modular parallel rectifier |
| CN116365855A (en) * | 2023-01-07 | 2023-06-30 | 安徽大学 | Starting control method for three-phase voltage type PWM rectifier |
| CN116365855B (en) * | 2023-01-07 | 2023-10-10 | 安徽大学 | Starting control method for three-phase voltage type PWM rectifier |
| CN116015037A (en) * | 2023-01-10 | 2023-04-25 | 合肥尚源电气科技有限公司 | Voltage type PWM rectifier control system for inhibiting starting overcurrent |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110445406B (en) | 2021-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104104221B (en) | Energy conversion system having active and reactive power decoupling compensation mechanism and method | |
| CN105375523B (en) | A kind of wind power full power current transformer high voltage crossing control method | |
| Bush et al. | A single-phase current source solar inverter with reduced-size DC link | |
| CN110048455B (en) | Droop control inverter with weak grid fault ride-through capability and control method thereof | |
| TWI523367B (en) | Control device and method for controlling power conversion unit | |
| US20130027997A1 (en) | Maximum power point tracking for power conversion system and method thereof | |
| CN110445406A (en) | A kind of bimodal smooth transition control method of PWM rectifier | |
| CN108880209B (en) | Active damping control method of active third harmonic injection matrix converter | |
| CN106712477A (en) | Simultaneous frequency-doubled and frequency-quadruplicated loop current suppression method suitable for MMC (Modular Multi-level Converter) | |
| CN104734545A (en) | PWM rectifier control method based on model prediction and voltage square control | |
| CN112332445B (en) | LCL grid-connected inverter indirect current control method based on instruction current compensation | |
| CN105356781B (en) | A kind of control method for suppressing the virtual power-angle curve skew of droop control inverter transient state | |
| CN111371340B (en) | Control method, device, equipment and medium for off-grid output voltage of energy storage converter | |
| CN101702583A (en) | Method for controlling direct-drive wind power generation convertor | |
| Chaudhary et al. | Harmonic reduction strategies for EV charging in power systems using shunt active power filter | |
| Liu et al. | Dynamic circulating current suppression method for multiple hybrid power parallel grid-connected inverters with model reference adaptive system | |
| CN103259281B (en) | There is energy conversion system and the method for negative-sequence current compensation mechanism | |
| CN107960144A (en) | DC-to-AC converter | |
| Qin et al. | A three-phase boost-type grid-connected inverter based on synchronous reference frame control | |
| Li et al. | An improved vector control strategy of VSC-HVDC connected to weak power grid | |
| Hlaing et al. | A permanent magnet synchronous generator control approach for stand-alone gas engine generation system | |
| Mayakrishnan et al. | Integrated Controller for Elimination of Harmonics in PMSG Based WECS Feeding Non Linear Load | |
| Szromba | Shunt power electronic buffer as active filter and energy flow controller | |
| CN105391045A (en) | Method for controlling direct-current transmission system based on voltage source converter | |
| JP6798248B2 (en) | Power converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |